An object is to narrow the width a frame part provided to a display device. The display device of the present invention comprises: a main substrate having display pixels being arranged in matrix, a scanning line electrode array, a signal line electrode array, and a frame part formed in an edge of the substrate along the scanning line electrode array and the signal line electrode array; a scanning line driving element mounted to the frame part along the scanning line electrode array; a signal line driving element mounted to the frame part along the signal line electrode array; and a flexible flat cable for supplying a signal and a power to the driving circuits of the scanning line driving element and the signal line driving element. The width of the frame part to which the signal line driving element is mounted is approximate to the width of the signal line driving element, and the width of the frame part to which the scanning line driving element is mounted is approximate to the width of the scanning line driving element. The length of at least the scanning line driving element or the signal line driving element is set shorter than the respective frame part so as to keep a space for mounting the flexible flat cable.